Section 9. Replacement of Parts; Alterations, Modifications and Additions.



 (a) Replacement of Parts. Lessee, at its own cost and expense, will promptly replace or cause to be replaced by the Approved Maintenance Provider, or applicable vendor of the same, all Parts which may from time to time become worn out, lost, stolen, destroyed, seized, confiscated, damaged beyond repair or permanently rendered unfit for use for any reason whatsoever. In addition, in the ordinary course of maintenance, service, repair, overhaul or testing, Lessee may, at its own cost and expense, cause to be removed any Parts, whether or not worn out, destroyed, damaged beyond repair or permanently rendered unfit for use, provided that Lessee shall immediately replace such Parts, at its own cost and expense. All replacement Parts shall be free and clear of all Liens, other than Liens permitted by Section 14 hereof, shall be in at least the same modification status and service bulletin accomplishment status, shall be interchangeable as to form, fit and function, and subject to Section 16 hereof, shall have been overhauled, repaired and inspected by an FAA approved agency and shall bear FAA acceptable tags, and shall be in as good an operating condition as, and have a value, utility and remaining useful life at least equal to, the Parts replaced (assuming such replaced Parts were in the condition and repair in which they were required to be maintained by the terms hereof) and all historical records relating to such replacement Parts shall be maintained by Lessee in English, and in compliance with the requirements of the FAA.